Sewing-machine



H. CORRALL.

SEWING MACHINE.

APPLICATION FILED FEB. 19, 1918.

1 ,397,622, Patented Nov. 22, 1921.

INVENTOR WITNESSES v umran stares HERBERT CORRALL, or HELENSBURGI-I, SCOTLAND, ASSIGNOR TO THE SINGER MANU- PATENT OFFICE.

nacrunnve COMPANY, A CORPORATION or NEW JERSEY.

SEWING-MACHINE.

7 have invented a certain new and useful Improvement in Sewing-Machines, of which the following 1s a specification.

This invention relates to an lmprovement in overseaming sewing machines of the type particularly adapted for attaching, by means of overedge stitches, the insoles to the uppers of felt or cloth slippers.

In the manufacture of this class of footwear it has heretofore been customary to secure the insole to theupper by hand sewing. An object of the present invention isthe construction of a sewing machine which will replace the operation of hand sewing and thereby result in a more uniform and neater product at a decreased cost. 7

The usualform of fur or glove sewing machine, fitted with opposed feed and presserwheels, normally in contact, has been found to be unsuitable for attaching the insoles to the uppers in that the presser-wheel interfered with the proper placing of the overseaming stitches at the toe and heel portion of. the slipper where a free manipulation of the material was found to be essential in the stitching operation According to the invention there is adaptedto the sewing machine, provided with a step-by-step rotatable feed wheel engaging the material to be stitched, a presser mechanism, the presser member of which is normally held outof engagement with the mate-' rial but, is brought into, and maintained in, engagement with the material during the period requisite for the proper formation of the 'stitch.

' Figure 1 of the accompanying drawings is ail elevation and Fig. 2 a plan of a practical construction of sewing machine embodying the invention. Fig. 3 is a detail sectional View.

The improvement is embodied in a machine provided with a base 15 from which rises the hollow upright standard 16 which is provided with suitable bearing lugs 1n which is journaled the main-shaft 4 trans- Specification of Letters Patent.

Patented Nov. 22, 1921.

Application filed February 19, 1918. Serial No. 218,016.

versely of the standard. Disposed in front of the standard is the vertical shaft 17 carrymg the feed-wheel 11. I

In the construction shown the presser bar 1, 1s endwise movable in horizontal bearings transversely of the main-shaft. It is surrounded by a block 2 slidable thereon and recelves reciprocatory movements in the axial direction of the presser-bar 1 from a moving part of the machine, for example from an eccentric 3 on the main shaft 4 embraced by an eccentric strap 5 connected to an arm 6 rocking on a fulcrum 7 disposed near the base of the machine frame, the upper end of the arm 6 being pivotally connected to the block 2 by means of a link 6.

Clamped near the forward end of the presser-bar 1 is the U-shaped arm 12 carrylng near its free end the presser 13 between which and the feed-wheel 11 the material is held during the period requisite for the proper formation of the stitc Fixed to the presser bar 1, between the block 2 and the presser 13, is a stop or collar 8 engageable by the block 2 whereby move-,

ment of the block 2 in the direction to bring the presser out of engagement with the work 1s %OSlt1V6ly transmitted to the presser-bar 1.

n the opposite side of the block 2 is( a spring, for example a helical sprin 9, which, if the presser bar be of tubular formation, may be accommodated within the presser-- bar 1, one end of the spring engaging a stop 2' secured, in fixed relation with the block 2 by the bolt 2 (see Fig. 3) and the other end engaging a preferably adjustable abutment, for example a screw or bush 10 threaded into or on to the end of the presser-bar,

by adjustment of which screw 'or bush 10 the spring 9 may be subjected to any required degree of initial stress;

As will be evident, when the block 2 is proportionate to the thickness of the goods being handled.

Inasmuch as the spring 9 is continuously in engagement with the block 2, and the spring 9 is only under slight stress at the time the presser comes into engagement with the work, the movement of the presser into engagement with the work is unaccompanied by shocks so that wear is minimized and silence of operation is insured.

In the reverse movement of the block 2' and consequent movement oi the presser away from the'work, the spring 9 is automatically unstressed.

The machine is equipped with .a stitchforming mechanism common to the usual 7 fur or glove type of machine and may be suchasis disclosed, for instance, in the patent to James Heggie, No. 1,094,? 15, of April 28, 1914, of which only the reciprocating needle v lat of the present improvement is shown.

During the operation of the machine the.

presser 13 clamps thematerial being stitched against the feed-wheel 11, which thereby receives the thrust of the needle 14 while it penetrates the 'material, the presser and. feed-wheel rigidly holding the material dur ing' the period requisite'qfor the proper formation of the stitch. When the stitch has been completed the presser recedes from the.

feed-wheel to permit afree manipulation of the material, which, in the meantime, is held against the feed-wheel by hand.

What I claim is 1. In a sewing machine, in combination, a feed-wheel against which the material is held during the feed movements thereof, a presser opposed to said feed-wheel, a mainshaft and connections for shifting the presser toward and away from the feed-wheel, said connections including a to-and-fro moving actuator, and a spring interposed between said actuator and presser and adapted to be compressed by theactuator in forcing the presser toward the ,feedwheel. H

2. In a sewingmachinc, in'combination, a base having a hollow upright standard, a feed-wheel against which the material is held manually during the feed movements thereof, a presser opposed to said feeds wheel, a main-shaftland connections for shifting the presser toward and away from the feedwheel and holding it insuch position during the feed, said connections including a to-andfro moving actuator, a longitudinally slidable presser -bar carrying said presser and mounted in said standard, and a spring interposed between said actuator and said presser-bar for compression by the actuatorin forcing the presser toward the feed-wheel. v r

3. In a sewing machine, in combination, a base having a hollow upright standard, a

feed-shaft disposed vertically in front of said standard, a feed-wheel carried by said shaft against which feed-wheel the material is held manually during the feed movements thereof, a presser opposed to said feedwheel, a main-shaft journaled transversely of said feed-shaft and supported bysaid; standard, and connections. for shifting the presser toward and away from the feedwheel and holding it in retracted position during the feed, said connections including a to-and-fro moving actuator, arlongitudinally slidable presser-bar supported in said standard transversely of said mainand feed-shafts and carrying said presser, and a spring interposed between said actuator and said presser-barter compression by the actuator in forcing the presser toward the feed-wheel.

a, In a sewing machine, in combination, a tubular presser-bar, a presser carried by said bar, a stop for said bar, a reciprocatory member movable longitudinally of saidbar and into engagement with said'stop to positively force the presser away from the material, and a spring within said tubular bar and continuously in engagement with aid reciprocatory member to, force the presser yieldingly against the material.

5 In a sewing machine, in combination, an endwise-movable presser-bar, a presser carried by said-bar, a stop for said bar,ra reciprocatory member movable longitudinally of said bar and.intoiengagementwith said stop to positively force the presser away from the material, a spring in. continuous engagement with said reciprocatory membe to force the. presser yieldingly. against the material, and means for varying theinitial stress of saidspring.

6. Ina sewing machine, in. combination,v an 'endwlsemovable presser-bar, a presser.

main-shaft journaled transversely of and I supported by said standard, a pressenbar extending transversely of said main shaft and slidably supported by said standard, and,

means connected with said main-shaft for reciprocating said presser-bar.

8. In a sewing maclnne, in combination,

a base having a hollow upright standard, a

main-shaft journaled transversely of and supported by said standard, a presser-bar extending transversely of said main-shaft and slidably supported by said standard, a

shaft disposed vertically in front of said In testimony whereof I have signed my standard, a feed-Wheel carried thereby, name to this specification-in the presence of means connected with said main-shaft for two subscribing Witnesses.

reciprocating said resser-bar, and a presser HERBERT CORRALL. carried by said presser-bar and adapted to Witnesses: intermittently clamp the Work against the HENRY MASON,

feed-Wheel; FLORENCE HOUSTON. 

